Index: gcc-8-8-20180308-1.1/src/libgo/runtime/getncpu-gnu.c
===================================================================
--- /dev/null
+++ gcc-8-8-20180308-1.1/src/libgo/runtime/getncpu-gnu.c
@@ -0,0 +1,16 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include <unistd.h>
+
+#include "runtime.h"
+#include "defs.h"
+
+int32
+getproccount(void)
+{
+	int32 n;
+	n = (int32)sysconf(_SC_NPROCESSORS_ONLN);
+	return n > 1 ? n : 1;
+}
Index: gcc-8-8-20180308-1.1/src/libgo/runtime/go-caller.c
===================================================================
--- gcc-8-8-20180308-1.1.orig/src/libgo/runtime/go-caller.c
+++ gcc-8-8-20180308-1.1/src/libgo/runtime/go-caller.c
@@ -116,7 +116,7 @@ __go_get_backtrace_state ()
 	 argv[0] (http://gcc.gnu.org/PR61895).  It would be nice to
 	 have a better check for whether this file is the real
 	 executable.  */
-      if (stat (filename, &s) < 0 || s.st_size < 1024)
+      if (filename != NULL && (stat (filename, &s) < 0 || s.st_size < 1024))
 	filename = NULL;
 
       back_state = backtrace_create_state (filename, 1, error_callback, NULL);